Snowball Earth
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The Snowball Earth hypothesis posits that the Earth's surface became entirely or nearly entirely frozen at least once, some time earlier than 650 Ma (million years ago). Proponents of the hypothesis argue that it best explains sedimentary deposits generally regarded as of glacial origin at tropical paleolatitudes, and other otherwise enigmatic features in the geological record. Opponents of the hypothesis contest the implications of the geological evidence for global glaciation, the geophysical feasibility of an ice- or slush-covered ocean, and the difficulty of escaping an all-frozen condition. There are a number of unanswered questions, including whether the Earth was a full snowball, or a "slushball" with a thin equatorial band of open (or seasonally open) water.
- See also: Wikipedia
- Related: Europa (moon), Greenhouse and icehouse Earth, Interglacial, Milankovitch cycles, Lake Nyos, Ice age
| Snowball Earth web site Snowball Earth web site www.snowballearth.org/index.html - Web |
| New Evidence Puts 'Snowball Earth' Theory Out In T... New Evidence Puts 'Snowball Earth' Theory Out In The Cold www.sciencedaily.com/releases/2007/03/070323104746.htm - Web |
| Channel 4 (UK) documentary, Catastrophe:Snowball E... Channel 4 (UK) documentary, Catastrophe:Snowball Earth www.channel4.com/programmes/catastrophe/4od#2917637 - Web |
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| First breath: Earth's billion-year struggle for ox... First breath: Earth's billion-year struggle for oxygen www.newscientist.com/.../mg20527461.100-first-breath-earths-billionyear-struggle-for-oxygen.html - Web |
| 'Snowball Earth' theory melted 'Snowball Earth' theory melted news.bbc.co.uk/2/hi/uk_news/scotland/1857545.stm - Web |
| Life may have survived 'Snowball Earth' in ocean p... Life may have survived 'Snowball Earth' in ocean pockets www.bbc.co.uk/news/science-environment-11992299 - Web |
